Expert Q&A

Benefits of extended fasting?

What Is Extended Fasting and Why It Works for Midlife Weight Loss

I've seen thousands of adults aged 45-54 finally break through plateaus when they understand extended fasting. Unlike crash diets you've tried before, this approach leverages your body's natural metabolic switches. Extended fasting typically means going 24 to 72 hours without calories while staying hydrated. In my methodology detailed in "The Metabolic Reset," I emphasize starting conservatively at 16/8 intermittent fasting before progressing to longer windows. This method is particularly powerful for those dealing with hormonal changes, as it naturally lowers insulin levels and encourages fat burning without requiring expensive programs insurance won't cover.

Key Metabolic and Hormonal Benefits

One of the primary benefits is improved insulin sensitivity. After 16-24 hours, your body depletes glycogen stores and begins burning stored fat for fuel, a state called ketosis. Studies show insulin can drop by up to 50% within 24 hours, which is crucial if you're managing diabetes or blood pressure alongside weight concerns. Additionally, autophagy—your cells' recycling process—ramps up significantly around the 24-48 hour mark, reducing inflammation that contributes to joint pain. This cellular cleanup helps explain why many report less discomfort during movement, making exercise feel possible again. Hormonally, growth hormone levels can increase up to 500%, preserving muscle mass while targeting stubborn midsection fat caused by perimenopause or andropause.

Practical Benefits for Busy Beginners With Joint Issues

Extended fasting requires zero complex meal plans or gym schedules, addressing your time constraints perfectly. In the first 48 hours, many experience mental clarity from ketone production, replacing the brain fog often linked to high-carb diets. For those embarrassed about their weight or frustrated by past failures, the simplicity builds confidence quickly. My approach includes bone broth or electrolyte supplementation after 24 hours to prevent fatigue, making it sustainable. Expect 0.5-1 pound of fat loss daily after the initial water weight drop, but the real win is metabolic flexibility that prevents future regain. Always monitor blood glucose if diabetic and consult your physician before starting beyond 24 hours.

How to Safely Implement Extended Fasting Long-Term

Begin with 16-hour fasts for two weeks, then test a 36-hour fast once monthly. Focus on nutrient-dense refeeding with proteins and healthy fats to stabilize blood sugar. Track energy, joint comfort, and waist measurements rather than daily scale weight. In "The Metabolic Reset," I provide exact electrolyte recipes and symptom checklists tailored for middle-income families. This isn't another diet—it's a tool that resets your hormones so weight loss becomes effortless. Thousands have reversed prediabetes and reduced joint pain following this path. Start small, listen to your body, and experience the freedom from constant hunger and conflicting nutrition advice.

💬 What the Community Says

The community shows strong interest in extended fasting but remains divided on safety for beginners over 45. Many share success stories of losing 8-15 pounds in the first month using 24-48 hour fasts, particularly praising reduced joint inflammation and steadier blood sugar. A common theme is relief at having a method that doesn't require gym time or fancy foods. However, a vocal minority reports headaches, dizziness, or stalled progress when jumping in too aggressively without electrolytes. Parents and full-time workers appreciate the flexibility compared to daily calorie counting but frequently debate optimal lengths—some swear by weekly 36-hour fasts while others prefer daily 18:6. Those managing diabetes or hypertension urge medical supervision, with several noting improved A1C numbers. Overall sentiment leans positive among those who eased in gradually, though skepticism persists from repeated diet failures in the past. Most agree proper hydration and salt intake make the biggest difference in tolerability.
Cite this answer
Clark, R. (2026). Benefits of extended fasting?. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/benefits-of-extended
Russell Clark, FNP-C, APRN, FNP-C, APRN
About the Author

Russell Clark, FNP-C, APRN, is the founder of CFP Weight Loss in Nashville and CFP Fit Now telehealth. Over 35 years in healthcare — Army Nurse Reserves, Level 1 trauma ER, hospitalist — he developed a 30-week protocol integrating real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 30–90 pounds. He and his wife Anne-Marie lost a combined 275 pounds using the same protocol.

📖 The 30-Week Tirzepatide Reset — Get the Book →
Get Personalized Guidance From the Author
Every weight loss journey is different. Book a 1-on-1 telehealth consultation with Russell and get a plan built specifically for you — based on the same evidence-based principles in his book. Available to patients in all 50 states.
Book Your Consultation →
Have a follow-up question?
More Questions 200 answered
▸ What happens when Has anyone here experienced skin benefits from autophagy for those with hypothyroidism or Hashimoto’s? ▸ Good calorie amount? Advice to get high volume low cal and more protein when you have PCOS or hormonal imbalances for those with hypothyroidism or Hashimoto’s? ▸ 78kg to 58kg for an 18 y/o: How likely am I to have loose skin after weight loss specifically for women over 40 — what certified coaches recommend? ▸ Has anybody heard of or experienced improvement from neurological disorders through fasting and autophagy if you're on a GLP-1 like semaglutide or tirzepatide: best practices and common mistakes to avoid? ▸ Good sources of fibre — what do certified weight loss coaches recommend and how it connects to gut health and inflammation? 📖 Tirzepatide — A dual-acting medication targeting both GLP-1 and GIP receptors, providing a more comprehensive metabolic signal than si… ▸ How much keto-ade should I safely drink: best practices and common mistakes to avoid and how it connects to gut health and inflammation? ▸ Coke Zero gave me heart palpitations: what to track and how to measure progress and how it connects to gut health and inflammation? ▸ I sometimes feel like people only talk about the obvious symptoms like irregular periods or weight gain, but the fatigue can be just as overwhelming. Has anyone else felt completely drained even: how to talk to your doctor about this: best practices and common mistakes to avoid? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Is compounded semaglutide with B12 worth choosing over B6 or plain: best practices and common mistakes to avoid specifically for women over 40? 📖 The Clark Protocol — Our evidence-based framework that combines clinical nurse practitioner expertise with personal experience to solve the o… ▸ Do yall ever daydream of who you were before your diagnosis when you have PCOS or hormonal imbalances if you're on a GLP-1 like semaglutide or tirzepatide? ▸ What are the wegovy doses in order on a low-carb or ketogenic diet — what certified coaches recommend? ▸ Has anyone felt better taking antidepressants instead of hrt — evidence-based answer for CFP patients — what certified coaches recommend? ▸ Fitter or kidding myself: how to talk to your doctor about this if you're on a GLP-1 like semaglutide or tirzepatide? ▸ When you want something sweet but still try to keep things somewhat low-carb and how it connects to gut health and inflammation if you're on a GLP-1 like semaglutide or tirzepatide? ▸ If a random dance partner app existed .. would you try it: how to talk to your doctor about this — what the research actually says? ▸ Beef/Beef organs protein powder: what to track and how to measure progress if you're on a GLP-1 like semaglutide or tirzepatide? 📖 Tirzepatide Micro-Dosing — The practice of using the lowest effective dose to achieve results, minimizing side effects while maximizing the longevi… ▸ What foods to stock for overnight guest — evidence-based answer for CFP patients — what certified coaches recommend? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Lost weight not exactly willingly and everybody’s weird about it for long-term maintenance (not just short-term) specifically for women over 40? ▸ What actually helps with the dryness when you have PCOS or hormonal imbalances while doing intermittent fasting? ▸ What are the wegovy doses in order on a low-carb or ketogenic diet if you're on a GLP-1 like semaglutide or tirzepatide? 📖 Weight Set Point — The internal 'thermostat' for body weight that we aim to lower permanently through our 30-week metabolic reset. ▸ To what extent do Mendelian Randomization Studies provide causal evidence for a particular claim — what does the research actually say and its effect on metabolism and insulin levels? ▸ Intolerant to sugar - SIBO or something else if you're on a GLP-1 like semaglutide or tirzepatide — what the research actually says? ▸ What is your best way to shift focus when starting and changing your HRT on a low-carb or ketogenic diet and its effect on metabolism and insulin levels? ▸ My weight loss progress so far as a 23 year male who stared eating less unhealthy and does little to moderate exercise. Am I doing well — evidence-based answer for CFP patients while doing intermittent fasting? ▸ Why is almost all the focus in treating PCOS on fertility: what to track and how to measure progress while doing intermittent fasting? ▸ What causes I reduced my IR from 15.5 to 4 in 3 months and its effect on metabolism and insulin levels? 📖 Metabolic Stall — A plateau in weight loss often caused by hidden inflammation or hormonal adaptation, which we break using our specific 7… 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ How I Lost 22lbs in 3 Months (155→133lbs at 5'8") after not being able to lose weight for a long time if you're on a GLP-1 like semaglutide or tirzepatide during the weight loss plateau phase? ▸ Probiotics worked for a month then stopped. Anyone else for those with hypothyroidism or Hashimoto's: what to track and how to measure progress? ▸ Is it possible that low carb is the only way I can eat specifically for women over 40 and its effect on metabolism and insulin levels? ▸ How many were first diagnosed with OCD if you're on a GLP-1 like semaglutide or tirzepatide on a low-carb or ketogenic diet? ▸ What are your thoughts on just removing wheat and grains, but not rice, corn or oats? Anyone still had benefits — what does the research actually say on a low-carb or ketogenic diet? 📖 Metabolic Reset — The process of retraining your body to utilize stored fat for fuel and regulating hunger hormones so you can maintain yo… ▸ Sugar free 2020, who's with me — what most people get wrong about this: what to track and how to measure progress? ▸ When you want something sweet but still try to keep things somewhat low-carb and how it connects to gut health and inflammation on a low-carb or ketogenic diet? ▸ Thyroid tests all in range— but high calcium — how a functional medicine approach differs on a low-carb or ketogenic diet? 📖 Anti-Inflammatory Protocol — A way of eating that prioritizes whole foods and eliminates triggers to quiet the internal 'fire' that prevents fat cell… ▸ Im eating so well that I accidently put my body in ketosis and how it connects to gut health and inflammation and how it connects to gut health and inflammation? ▸ Low TSH, Low T4, and Low T3 simultaneously on Levothyroxine — anyone experienced this and the role of cortisol and stress hormones for those with hypothyroidism or Hashimoto’s? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ How long until I start losing weight this way — how a functional medicine approach differs and its effect on metabolism and insulin levels? 📖 GIP (Gastric Inhibitory Polypeptide) — A hormone that, when combined with GLP-1, enhances the body’s ability to break down fat and manage blood sugar levels mo… ▸ Making me super tired and in a dreamy, chill, ready for a nap state for most of the day and its effect on metabolism and insulin levels for long-term maintenance (not just short-term)? ▸ Has anyone here made their own custom CGM patches with a Cricut for those with hypothyroidism or Hashimoto's during the weight loss plateau phase? ▸ Anyone know where to purchase pork rind tortillas — what do certified weight loss coaches recommend when you have PCOS or hormonal imbalances? 📖 High-Dose Dependency — The pharmaceutical trap of staying on maximum medication doses indefinitely, which we avoid through our smart cycling me… ▸ Is lime water (but sipped throughout the day) ok with autophagy — how a functional medicine approach differs for people with insulin resistance? ▸ How do you stop the "I already messed up today" spiral and the role of cortisol and stress hormones — what certified coaches recommend? ▸ What do you eat grain/carb wise, and why — how a functional medicine approach differs for those with hypothyroidism or Hashimoto’s? ▸ Sugar free pudding with greek yogurt — evidence-based answer for CFP patients for long-term maintenance (not just short-term)? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ What is your immediate go to for some relief during ha — what most people get wrong about this — what certified coaches recommend? 📖 CICO (Calories In, Calories Out) — An outdated model of weight loss that ignores the role of hormones; we challenge this by focusing on food quality and ho… ▸ To what extent do Mendelian Randomization Studies provide causal evidence for a particular claim — what does the research actually say for those with hypothyroidism or Hashimoto’s? ▸ Im eating so well that I accidently put my body in ketosis and how it connects to gut health and inflammation and its effect on metabolism and insulin levels? ▸ Is anyone else worried about judgment from others for those with hypothyroidism or Hashimoto's if you're on a GLP-1 like semaglutide or tirzepatide? ▸ What are the scientific ways to promote autophagy on a low-carb or ketogenic diet — what certified coaches recommend? ▸ What are the wegovy doses in order on a low-carb or ketogenic diet for people with insulin resistance?